| Andy Shevchenko | 1b2e98b | 2013-04-09 14:05:43 +0300 | [diff] [blame] | 1 | /* |
| 2 | * ACPI helpers for DMA request / controller |
| 3 | * |
| 4 | * Based on of_dma.h |
| 5 | * |
| 6 | * Copyright (C) 2013, Intel Corporation |
| 7 | * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | */ |
| 13 | |
| 14 | #ifndef __LINUX_ACPI_DMA_H |
| 15 | #define __LINUX_ACPI_DMA_H |
| 16 | |
| 17 | #include <linux/list.h> |
| 18 | #include <linux/device.h> |
| 19 | #include <linux/dmaengine.h> |
| 20 | |
| 21 | /** |
| 22 | * struct acpi_dma_spec - slave device DMA resources |
| 23 | * @chan_id: channel unique id |
| 24 | * @slave_id: request line unique id |
| 25 | * @dev: struct device of the DMA controller to be used in the filter |
| 26 | * function |
| 27 | */ |
| 28 | struct acpi_dma_spec { |
| 29 | int chan_id; |
| 30 | int slave_id; |
| 31 | struct device *dev; |
| 32 | }; |
| 33 | |
| 34 | /** |
| 35 | * struct acpi_dma - representation of the registered DMAC |
| 36 | * @dma_controllers: linked list node |
| 37 | * @dev: struct device of this controller |
| 38 | * @acpi_dma_xlate: callback function to find a suitable channel |
| 39 | * @data: private data used by a callback function |
| Andy Shevchenko | ee8209f | 2013-05-08 11:55:48 +0300 | [diff] [blame] | 40 | * @base_request_line: first supported request line (CSRT) |
| 41 | * @end_request_line: last supported request line (CSRT) |
| Andy Shevchenko | 1b2e98b | 2013-04-09 14:05:43 +0300 | [diff] [blame] | 42 | */ |
| 43 | struct acpi_dma { |
| 44 | struct list_head dma_controllers; |
| 45 | struct device *dev; |
| 46 | struct dma_chan *(*acpi_dma_xlate) |
| 47 | (struct acpi_dma_spec *, struct acpi_dma *); |
| 48 | void *data; |
| Andy Shevchenko | ee8209f | 2013-05-08 11:55:48 +0300 | [diff] [blame] | 49 | unsigned short base_request_line; |
| 50 | unsigned short end_request_line; |
| Andy Shevchenko | 1b2e98b | 2013-04-09 14:05:43 +0300 | [diff] [blame] | 51 | }; |
| 52 | |
| 53 | /* Used with acpi_dma_simple_xlate() */ |
| 54 | struct acpi_dma_filter_info { |
| 55 | dma_cap_mask_t dma_cap; |
| 56 | dma_filter_fn filter_fn; |
| 57 | }; |
| 58 | |
| 59 | #ifdef CONFIG_DMA_ACPI |
| 60 | |
| 61 | int acpi_dma_controller_register(struct device *dev, |
| 62 | struct dma_chan *(*acpi_dma_xlate) |
| 63 | (struct acpi_dma_spec *, struct acpi_dma *), |
| 64 | void *data); |
| 65 | int acpi_dma_controller_free(struct device *dev); |
| 66 | int devm_acpi_dma_controller_register(struct device *dev, |
| 67 | struct dma_chan *(*acpi_dma_xlate) |
| 68 | (struct acpi_dma_spec *, struct acpi_dma *), |
| 69 | void *data); |
| 70 | void devm_acpi_dma_controller_free(struct device *dev); |
| 71 | |
| 72 | struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev, |
| 73 | size_t index); |
| 74 | struct dma_chan *acpi_dma_request_slave_chan_by_name(struct device *dev, |
| 75 | const char *name); |
| 76 | |
| 77 | struct dma_chan *acpi_dma_simple_xlate(struct acpi_dma_spec *dma_spec, |
| 78 | struct acpi_dma *adma); |
| 79 | #else |
| 80 | |
| 81 | static inline int acpi_dma_controller_register(struct device *dev, |
| 82 | struct dma_chan *(*acpi_dma_xlate) |
| 83 | (struct acpi_dma_spec *, struct acpi_dma *), |
| 84 | void *data) |
| 85 | { |
| 86 | return -ENODEV; |
| 87 | } |
| 88 | static inline int acpi_dma_controller_free(struct device *dev) |
| 89 | { |
| 90 | return -ENODEV; |
| 91 | } |
| 92 | static inline int devm_acpi_dma_controller_register(struct device *dev, |
| 93 | struct dma_chan *(*acpi_dma_xlate) |
| 94 | (struct acpi_dma_spec *, struct acpi_dma *), |
| 95 | void *data) |
| 96 | { |
| 97 | return -ENODEV; |
| 98 | } |
| 99 | static inline void devm_acpi_dma_controller_free(struct device *dev) |
| 100 | { |
| 101 | } |
| 102 | |
| 103 | static inline struct dma_chan *acpi_dma_request_slave_chan_by_index( |
| 104 | struct device *dev, size_t index) |
| 105 | { |
| 106 | return NULL; |
| 107 | } |
| 108 | static inline struct dma_chan *acpi_dma_request_slave_chan_by_name( |
| 109 | struct device *dev, const char *name) |
| 110 | { |
| 111 | return NULL; |
| 112 | } |
| 113 | |
| 114 | #define acpi_dma_simple_xlate NULL |
| 115 | |
| 116 | #endif |
| 117 | |
| 118 | #define acpi_dma_request_slave_channel acpi_dma_request_slave_chan_by_index |
| 119 | |
| 120 | #endif /* __LINUX_ACPI_DMA_H */ |